An energy usage monitor for Mac, and some layer-backed throbber experiments

chrome/browser/ui/energy_browsertest.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/base_switches.h"
+#include "base/command_line.h"
+#include "base/test/energy_monitor_mac.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/interactive_test_utils.h"
+#include "content/public/test/web_contents_tester.h"
+
+//#include "chrome/test/base/browser_with_content_test.h"
+
+const int kWarmupTimeSeconds = 5;
+const int kNumSamples = 200;  // 10 seconds with the default 50ms interval.
+
+using base::test::EnergyMonitorMac;
+
+// Note these should be run with --single_process passed in to the test harness.
+// However, the test harness always adds it to the browser command line so
+// there's no point checking.
+class EnergyTest : public InProcessBrowserTest {
+ public:
+  EnergyTest() {}
+
+  void SetUpOnMainThread() override {
+    EXPECT_TRUE(ui_test_utils::BringBrowserWindowToFront(browser()));
+
+    TabStripModel* tab_strip = browser()->tab_strip_model();
+    EXPECT_TRUE(tab_strip);
+
+    // Note: Real browser_tests shouldn't be using CreateTestWebContents().
+    web_contents_ = content::WebContentsTester::CreateTestWebContents(
+        browser()->profile(), nullptr);
+    EXPECT_TRUE(web_contents_);
+
+    tab_strip->InsertWebContentsAt(0, web_contents_, TabStripModel::ADD_ACTIVE);
+    web_contents_tester_ = content::WebContentsTester::For(web_contents_);
+    EXPECT_TRUE(web_contents_tester_);
+  }
+
+  void PressTab() {
+    // BringBrowserWindowToFront() gives the omnibox focus and flashes the
+    // cursor. To stop the flashing cursor dirtying results, press Tab.
+    EXPECT_TRUE(ui_test_utils::SendKeyPressSync(browser(), ui::VKEY_TAB, false,
+                                                false, false, false));
+  }
+
+  void RunEnergyTest(const char* suffix) {
+    EnergyMonitorMac energy_monitor;
+    energy_monitor.Run(base::TimeDelta::FromSeconds(kWarmupTimeSeconds),
+                       kNumSamples);
+
+    if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+            switches::kTraceToFileName)) {
+      base::FilePath path =
+          base::CommandLine::ForCurrentProcess()->GetSwitchValuePath(
+              switches::kTraceToFileName);
+
+      path = path.AppendASCII(suffix);
+      energy_monitor.WriteTimeSeries(path);  // Overwrites.
+
+      path = path.AppendASCII(".log");
+      std::ostringstream logline;
+      logline << base::Time::Now() << ','
+              << energy_monitor.GetAverageWatts(EnergyMonitorMac::PROCESSOR)
+              << ','
+              << energy_monitor.GetStdDevWatts(EnergyMonitorMac::PROCESSOR)
+              << ',' << energy_monitor.GetAverageWatts(EnergyMonitorMac::IA)
+              << ',' << energy_monitor.GetStdDevWatts(EnergyMonitorMac::IA);
+
+      base::AppendToFile(path, logline.str().data(), logline.str().size());
+    }
+
+    VLOG(0) << "\nAverage Processor: "
+            << energy_monitor.GetAverageWatts(EnergyMonitorMac::PROCESSOR)
+            << "\nStdDev Processor: "
+            << energy_monitor.GetStdDevWatts(EnergyMonitorMac::PROCESSOR)
+            << "\nAverage IA: "
+            << energy_monitor.GetAverageWatts(EnergyMonitorMac::IA)
+            << "\nStdDev IA: "
+            << energy_monitor.GetStdDevWatts(EnergyMonitorMac::IA);
+  }
+
+ protected:
+  content::WebContents* web_contents_ = nullptr;
+  content::WebContentsTester* web_contents_tester_ = nullptr;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(EnergyTest);
+};
+
+IN_PROC_BROWSER_TEST_F(EnergyTest, Idle) {
+  PressTab();
+  RunEnergyTest("-idle");
+}
+
+IN_PROC_BROWSER_TEST_F(EnergyTest, FlashingCursor) {
+  RunEnergyTest("-cursor");
+}
+
+IN_PROC_BROWSER_TEST_F(EnergyTest, SingleThrobber) {
+  web_contents_tester_->TestSetIsLoading(true);
+  PressTab();
+  RunEnergyTest("-throbber");
+}